Answer:
I make billions of dollars selling windows. Who am I?
What has many keys but can't open a single lock?
I make a loud sound when I'm changing. When I do change I get bigger but weigh less. What am I?
I'm not really more than holes tied to more holes; I'm strong as good steel, though not as stiff as a pole.
I've got a beautiful beautiful hall all walled in red velvet with all white armchairs made of bone and in the middle a woman dances.
If it’s information you seek, come and see me. If it’s pairs of letters you need, I have consecutively three. What am I?